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"The treaty's prohibition section, if it were in force today, would prohibit the ongoing supply of weapons and parts and components to the Assad regime in Syria," said Daryl G. Kimball, executive director of the ACA, a national group that works on arms-control policies.

"They've been vague about exactly what Iran needs to do to merit sanctions relief, and one reason is because Iran's program has been improving," said Daryl G. Kimball, executive director of the Arms Control Association, a nonpartisan organization based in Washington.